Dede was arrested Tuesday in Fort Worth, and Allen is in custody in Louisiana. No details of the arrests were immediately available.

'Had to kill someone'

Witnesses said the pair, accompanied by another man, approached Williams about 6:50 p.m. at the apartments and ordered him to lie on the ground, according to a criminal complaint. One of the attackers shot and killed Williams when he didn't comply, police said.

One of the witnesses said that Allen later told him that he "had to kill someone up at Greens-_point a couple of days ago during a robbery," the complaint states.

The other witness told investigators that Dede said that he and Allen "were trying to rob someone" at a Greenspoint-area apartment and that "Kendall Allen had to shoot and kill someone," according to the complaint.

Killed with shotgun

"Dede told him (the second witness) that during the robbery Kendall Allen told the victim to get on the ground and that when the victim did not comply, Kendall Allen shot him with the shotgun," police said.

Police are looking for a third man to question about the homicide. Anyone with information about that person is urged to contact the HPD Homicide Division at 713-308-3600 or Crime Stoppers at 713-222-TIPS.